Gas tungsten arc welding (GTAW), also known as tungsten inert gas (TIG) welding, is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. The weld area and electrode is protected from oxidation or other atmospheric contamination by an inert shielding gas (argon or helium), and a filler metal is normally used, though some welds, known as autogenous welds, do not require it.
Q: I've heard different opinions about which size and type of tungsten electrode I should use to gas tungsten arc weld (GTAW) aluminum. Could you clear up this subject for me? A: As you know, we use direct current electrode negative (DCEN), or straight polarity, to weld steels and stainless steels.